CN110239264B

CN110239264B - Automatic eraser

Info

Publication number: CN110239264B
Application number: CN201910571624.1A
Authority: CN
Inventors: 不公告发明人
Original assignee: Anhui Yinuo Youth Industrial Design Co ltd
Current assignee: Anhui Yinuo Youth Industrial Design Co ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-10-30
Anticipated expiration: 2039-06-25
Also published as: CN110239264A

Abstract

The invention discloses an automatic eraser which comprises a main shell and a grip groove arranged in the main shell, wherein a grip part is arranged in the grip groove, the grip part comprises grip rods which are vertically symmetrical, the right side of the grip groove is communicated with and provided with vertically symmetrical connecting rod cavities, power switching parts which can be matched with the grip rods are arranged in the connecting rod cavities, and spring cavities are communicated and arranged in the inner walls of the front side and the rear side of the grip groove; the automatic eraser is more reasonable and ingenious in overall structure, is very convenient to use, can play a role in exercising hand strength besides the function of automatically erasing handwriting, can control the spring switching component and the rotating component to work by means of a single driving motor, is high in use safety, and has high use and popularization values.

Description

Automatic eraser

Technical Field

The invention relates to the technical field of stationery, in particular to an automatic eraser.

Background

Eraser, known as rubber in British and Australia; however, in the united states, rubber is one of the popular names of condoms, and the name of the eraser is eraser, which is often used by americans for laughing, the existing erasers are various in variety and meet different requirements, the erasers in the prior art need to erase handwriting manually, but parts which are not desired to be erased are easy to erase together when the eraser is used repeatedly, so that the erasers are inconvenient to use, and the eraser is used in large quantities in student groups, so that the eraser has great influence if an effective and easy-to-implement new body-building mode is added, and therefore, an automatic eraser capable of automatically erasing handwriting and exercising hand strength is needed.

Disclosure of Invention

The invention aims to provide an automatic eraser which is used for overcoming the defects in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: an automatic eraser comprises a main shell, a grip groove arranged in the main shell, a grip part arranged in the grip groove and comprising grip rods which are vertically symmetrical, a connecting rod cavity which is vertically symmetrical and communicated with the right side of the grip groove, a power switching part which can be matched with the grip rods and is arranged in the connecting rod cavity, spring cavities communicated with the inner walls of the front side and the rear side of the grip groove, a spring switching part arranged in the spring cavity, a spring switching gear which can be in meshing fit connection with the switching gear in the power switching part and is arranged in the spring switching part, an annular groove arranged on the right side of the connecting rod cavity and communicated with the annular groove, a rotating part arranged in the annular groove and provided with a first rotating gear which can be meshed with the switching gear, and a first rotating shaft fixedly connected with the axis of the first rotating gear, the front end of the first rotating shaft is fixedly connected with a first rotating mechanism, the right end of the first rotating mechanism is connected with a second rotating mechanism on the upper side of the annular groove in a rotating fit manner through a belt, the lower end of the second rotating mechanism can be connected with the upper end of a sliding ring in the annular groove in a tooth-shaped meshing fit manner, the sliding ring can be connected with a first rotating rod which is symmetrical up and down in the power switching component in a pushing fit manner, the right end of the annular groove is fixedly connected with a first clamping block, the right side of the annular groove is provided with a rotating ring, the left end of the rotating ring is provided with a first clamping block groove which can be matched with the first clamping block, the inner side of the annular groove is communicated with a rubber hole, a rubber which can slide left and right and rotate is arranged in the rubber hole, second clamping block grooves are arranged in an annular array manner on the rubber, and second clamping blocks which are arranged in an annular, and a pneumatic component is arranged on the left side of the rubber.

Further technical scheme, the spring-grip part include with holding rod fixed connection's finger type hand protector, running fit be connected with on the holding rod with holding power groove front and back side inner wall rotary type fixed connection's first holding shaft, the first arc wall of symmetry around being provided with in the holding power inslot, fixedly connected with can on the holding rod first arc wall gliding sliding shaft that leads.

In a further technical scheme, the power switching part comprises a second rotating rod which is arranged in the connecting rod cavity and can be matched with the holding rod, a rotating shaft is arranged on the second rotating rod, the second rotating rod is connected with the first rotating rod in a rotating fit manner through a second guide sliding shaft, second arc-shaped grooves which can be matched with the second guide sliding shaft are symmetrically arranged on the inner walls of the front side and the rear side of the second rotating rod, a sliding hole is arranged in the first rotating rod, a guide sliding rod extending through the sliding hole is arranged in the connecting rod cavity, a sliding groove is arranged in the inner wall of the lower side of the annular groove, a sliding block which can be connected with the sliding ring in a push fit manner and can slide up and down is arranged in the sliding groove, a first spring resetting mechanism is fixedly connected to the left side and the right side of the sliding block, and a first transmission mechanism which is connected with the left end in, the power tool is characterized in that a first sliding cavity is formed in the inner wall of the rear side of the grip groove, a rotatable first rotating shaft is arranged in the first sliding cavity, the right end of the first rotating shaft can be connected with the left end of the first transmission mechanism in a belt rotation fit mode, a first gear is fixedly connected to the first rotating shaft, the front end of the first gear is connected with a first sliding block capable of sliding up and down in a meshing fit mode, a power motor is fixedly arranged in the first sliding block, a rotating cavity is formed in the front side of the first sliding cavity, a power hole is formed in the first sliding cavity in a communicating mode, and the front end of the power motor is connected with a second rotating shaft capable of switching over the gear fixed connection in a power fit mode.

According to the technical scheme, the spring switching component comprises a spring sliding groove, the opening of the spring sliding groove is opposite to that of the holding rod, the spring sliding groove is communicated with the spring cavity, first guide sliding grooves are symmetrically formed in the inner walls of the left side and the right side of the spring sliding groove, spring frame bodies which are symmetrical in the front and the back and can slide in the front and the back are arranged in the spring sliding groove, holding springs which are arranged in an array mode and different in elasticity are arranged between the spring frame bodies, the upper end and the lower end of each holding spring are fixedly connected with spring sliding blocks, hollow pipes are fixedly arranged in the spring sliding blocks, elastic ropes which are fixedly connected with the two ends of the hollow pipes and the spring frame bodies are arranged in the hollow pipes, the left end and the right end of each spring sliding block are fixedly connected with first guide sliding blocks in the first guide sliding grooves, second sliding cavities which are symmetrical in the front and the back are communicated with the upper sides of the And the sliding screw rod is symmetrically provided with second sliding blocks which are fixedly connected with the upper end of the spring frame body in a front-back manner.

According to the technical scheme, the pneumatic component comprises an inflator pump which is arranged in the grip groove and is fixedly connected with the grip rod, a first one-way valve only allowing air to enter is arranged at the left end of the inflator pump, a second one-way valve only allowing air to exit is arranged at the right end of the inflator pump, an inflation tube is fixedly connected with the right end of the second one-way valve, the right end of the inflation tube extends into the inner wall of the right side of the grip groove and is communicated with an air pressure cavity in the grip groove, an exhaust valve is arranged on the inner wall of the rear side in the air pressure cavity, and a second spring reset mechanism fixedly connected with the rubber is arranged on the inner wall of the upper.

The invention has the beneficial effects that:

through the arrangement of the power switching part, the same motor can enable the spring switching part and the rotating part to work, so that the energy consumption is greatly saved, and the cost of the device is reduced;

through the arrangement of the spring-grip dumb-bells, the exercise and the rubber are combined, so that the hand strength of people can be slowly exercised in the using process;

through the setting of spring switching part, can be according to the size of condition automatic adjustment spring force, the scientific exercise and the use of stationery.

The automatic eraser is more reasonable and ingenious in overall structure, is very convenient to use, can play a role in exercising hand strength besides the function of automatically erasing handwriting, can control the spring switching component and the rotating component to work by means of a single driving motor, is high in use safety, and has high use and popularization values.

Drawings

FIG. 1 is a schematic view of the internal structure of an automatic eraser according to the invention;

FIG. 2 is a cross-sectional view taken in the direction "A-A" of FIG. 1 in accordance with the present invention;

FIG. 3 is a cross-sectional view taken in the direction "B-B" of FIG. 1 in accordance with the present invention;

FIG. 4 is a cross-sectional view taken in the direction "C-C" of FIG. 1 in accordance with the present invention;

FIG. 5 is an enlarged schematic view of "D" of FIG. 2 of the present invention;

FIG. 6 is an enlarged schematic view of "E" in FIG. 2 of the present invention.

Detailed Description

The invention will now be described in detail with reference to fig. 1-6, for convenience of description, the following orientations will now be defined: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

Referring to fig. 1-6, an automatic eraser according to an embodiment of the present invention comprises a main housing 91, a grip groove 56 disposed in the main housing 91, a grip member disposed in the grip groove 56, the grip member including a grip rod 89 that is vertically symmetrical, a link chamber 90 that is vertically symmetrical and is disposed in communication with a right side of the grip groove 56, a power switching member that is engageable with the grip rod 89 disposed in the link chamber 90, a spring chamber 50 disposed in communication with an inner wall of a front and rear side of the grip groove 56, a spring switching member disposed in the spring chamber 50, a spring switching gear 75 disposed in the spring switching member and engageable with a switching gear 34 disposed in the power switching member, an annular groove 77 disposed in communication with a right side of the link chamber 90, a rotating member disposed in the annular groove 77, and a first rotating gear 54 that is engageable with the switching gear 34 disposed in the rotating member, a first rotating shaft 82 is fixedly connected to the axis of the first rotating gear 54, a first rotating mechanism 44 is fixedly connected to the front end of the first rotating shaft 82, the right end of the first rotating mechanism 44 is connected with a second rotating mechanism 17 on the upper side of the annular groove 77 in a rotating fit manner through a belt, the lower end of the second rotating mechanism 17 can be connected with the upper end of a sliding ring 16 in the annular groove 77 in a tooth-shaped engagement fit manner, the sliding ring 16 can be connected with a first rotating rod 19 which is symmetrical up and down in the power switching component in a push fit manner, the right end of the annular groove 77 is fixedly connected with a first clamping block 67, a rotating ring 47 is arranged on the right side of the annular groove 77, a first clamping block groove 57 which can be matched with the first clamping block 67 is arranged at the left end of the rotating ring 47, a rubber hole 48 is communicated with the inner side of the annular groove 77, and a rubber 87 which, the rubber 87 is provided with second block grooves 97 which are arranged in an annular array, the lower end of the rotating ring 47 is fixedly connected with second blocks 27 which are arranged in an annular array and extend into the second block grooves 97, the left side of the rubber 87 is provided with a pneumatic component, in an initial state, the power switching component can enable the switching gear 34 to rotate, the switching gear 34 rotates to drive the spring switching gear 75 to rotate, the spring switching gear 75 rotates to enable the spring switching component to work, the holding rod 89 is continuously extruded to enable the pneumatic component to work to push the second block grooves 97 rightwards, the holding rod 89 is extruded to enable the first rotating rod 19 in the power switching component to push the sliding ring 16 to slide rightwards, the upper end of the sliding ring 16 is meshed with the second rotating mechanism 17, and the first blocks 67 are clamped into the first block grooves 57, the switching gear 34 is meshed with the first rotating gear 54, the switching gear 34 is disengaged from the spring switching gear 75, the switching gear 34 is rotated, the switching gear 34 drives the first rotating gear 54 to rotate, the first rotating gear 54 drives the first rotating shaft 82 to rotate, the first rotating shaft 82 drives the first rotating mechanism 44 to rotate, the first rotating mechanism 44 drives the second rotating mechanism 17 to rotate, the second rotating mechanism 17 drives the sliding ring 16 to rotate, the sliding ring 16 drives the rotating ring 47 to rotate, and the rotating ring 47 drives the rubber 87 to rotate, so that the device can work, handwriting can be automatically erased, the holding power of a hand can be exercised in the using process, and exercise and learning are combined.

Beneficially or exemplarily, the grip device component comprises a finger-shaped hand guard 85 fixedly connected with the grip rod 89, the grip rod 89 is connected with a first grip shaft 18 in a rotating and fixed connection with the inner walls of the front and back sides of the grip groove 56 in a rotating and matching manner, a first arc-shaped groove 69 symmetrical front and back is arranged in the grip groove 56, a first sliding guide shaft 59 capable of sliding in the first arc-shaped groove 69 is fixedly connected with the grip rod 89, the finger-shaped hand guard 85 is held by a hand, and the grip rod 89 can rotate around the first grip shaft 18 by being pressed with force, so that the hand strength can be exercised.

Beneficially or exemplarily, the power switching component includes a second rotating rod 98 disposed in the connecting rod cavity 90 and capable of being matched with the holding rod 89, the second rotating rod 98 is provided with a rotating shaft 80, the second rotating rod 98 is connected with the first rotating rod 19 in a rotating matching manner through a second sliding guide shaft 78, second arc-shaped grooves 66 capable of being matched with the second sliding guide shaft 78 are symmetrically disposed on inner walls of front and rear sides of the second rotating rod 98, a sliding hole 68 is disposed in the first rotating rod 19, a sliding guide rod 58 extending through the sliding hole 68 is disposed in the connecting rod cavity 90, a sliding groove 28 is disposed in an inner wall of a lower side of the annular groove 77, a sliding block 38 whose upper end is connected with the sliding ring 16 in a pushing matching manner and capable of sliding up and down is disposed in the sliding groove 28, and a first spring return mechanism 37 is fixedly connected to left and right ends of the sliding block 38, a first transmission mechanism 83 with the left end connected in a matched and driven manner through a belt is connected to the rear side of the sliding block 38 in a meshed and matched manner, a first sliding cavity 15 is arranged in the inner wall of the rear side of the grip groove 56, a rotatable first rotating shaft 35 is arranged in the first sliding cavity 15, the right end of the first rotating shaft 35 can be connected with the left end of the first transmission mechanism 83 in a matched and driven manner through a belt, a first gear 25 is fixedly connected to the first rotating shaft 35, a first sliding block 14 capable of sliding up and down is connected to the front end of the first gear 25 in a meshed and matched manner, a power motor 45 is fixedly arranged in the first sliding block 14, a rotating cavity 65 is arranged on the front side of the first sliding cavity 15, a power hole 24 is communicated between the rotating cavity 65 and the first sliding cavity 15, a second rotating shaft 55 fixedly connected with the switching gear 34 is connected to the front end of the power motor 45 in a power matched manner, the holding rod 89 promotes the second dwang 98, the second dwang 98 winds the axis of rotation 80 rotates the drive the right-hand member of first dwang 19 slides right, first dwang 19 promotes slip ring 16 slides right and promotes sliding block 38 slides down, sliding block 38 slides down and passes through first drive mechanism 83 drives first dwang 35 rotates, first dwang 35 drives first gear 25 rotates, first gear 25 rotates and makes first slider 14 upwards slides, first slider 14 upwards slides and makes switching gear 34 with first rotating gear 54 meshes, can follow power spring switching device switches to rotary part.

Beneficially or exemplarily, the spring switching component includes spring sliding grooves 39 disposed in the holding rod 89 and having opposite openings and communicating with the spring cavity 50, first guide sliding grooves 49 are symmetrically disposed in inner walls of left and right sides of the spring sliding grooves 39, spring frame bodies 33 which are symmetrical in front and back and can slide in front and back are disposed in the holding force groove 56, holding force springs 79 which are arranged in an array and have different elastic forces are disposed between the spring frame bodies 33, spring sliders 29 which are symmetrical and extend into the spring sliding grooves 39 are fixedly connected to upper and lower ends of the holding force springs 79, hollow tubes 13 are fixedly disposed in the spring sliders 29, elastic ropes 94 whose two ends are fixedly connected to the spring frame bodies 33 are disposed in the hollow tubes 13, first guide sliding blocks 70 which extend into the first guide sliding grooves 49 are fixedly connected to left and right ends of the spring sliders 29, and second sliding cavities 63 which are symmetrical in front and back are communicated to upper sides of the holding force grooves 56, the second sliding cavity 63 is internally provided with a sliding screw 93, the rear end of the sliding screw 93 extends into the rotating cavity 65 and is fixedly connected with the spring switching gear 75, the sliding screw 93 is symmetrically provided with second sliding blocks 92, the second sliding blocks 92 are fixedly connected with the upper end of the spring frame 33, the power motor 45 is turned on, the power motor 45 drives the second rotating shaft 55 to rotate, the second rotating shaft 55 drives the switching gear 34 to rotate, the switching gear 34 drives the spring switching gear 75 to rotate, the spring switching gear 75 drives the sliding screw 93 to rotate, the sliding screw 93 rotates to drive the second sliding block 92 to slide back and forth, the second sliding block 92 pushes the spring sliding block 29 to slide back and forth, the spring sliding block 29 drives the grip spring 79 to slide back and forth to switch, and the magnitude of the spring force can be adjusted according to different people, and the switching is very simple and convenient.

Beneficially or exemplarily, the pneumatic component includes an inflator 99 disposed in the grip groove 56 and fixedly connected to the grip rod 89, the inflator 99 is disposed at a left end thereof with a first one-way valve 95 capable of only introducing air and disposed at a right end thereof with a second one-way valve 86 capable of only discharging air, the second one-way valve 86 is fixedly connected to a right end thereof with an inflator 76, the right end of the inflator 76 extends into the inner wall of the right side of the grip groove 56 and is communicated with an air pressure chamber 46 therein, the air pressure chamber 46 is disposed with an exhaust valve 36 disposed thereon at a rear inner wall thereof, the inner walls of the upper and lower sides of the air pressure chamber 46 are disposed with a second spring return mechanism 26 fixedly connected to the rubber 87, the finger-shaped hand guard 85 is held by a hand and squeezed, the right end of the grip rod 89 is opened, the grip rod 89 drives the inflator 99 to open and suck air through the first one-way valve 95, the grip spring 79 is returned and the inflator 99 is returned to squeeze other passages in the inflator 99 after the hand The inflation tube 76 enters the air pressure cavity 46, the rubber 87 can be extruded rightwards through air pressure after being extruded for multiple times, the extending length of the rubber 87 can be flexibly controlled, and the aim of exercising arm strength can be achieved through the operation process.

When the device is used, the power motor 45 is turned on, the power motor 45 drives the second rotating shaft 55 to rotate, the second rotating shaft 55 drives the switching gear 34 to rotate, the switching gear 34 drives the spring switching gear 75 to rotate, the spring switching gear 75 drives the sliding screw 93 to rotate, the sliding screw 93 rotates to drive the second slider 92 to slide back and forth, the second slider 92 pushes the spring slider 29 to slide back and forth, the spring slider 29 drives the grip spring 79 to slide back and forth for switching, after the switching is finished, the finger-shaped hand guard 85 is held by a hand and squeezed, the right end of the grip rod 89 is opened, the grip rod 89 drives the inflator 99 to open and suck air through the first one-way valve 95, after the hand is released, the grip spring 79 is reset, the inflator 99 resets and squeezes other materials in the inflator 99 to enter the air pressure cavity 46 through the inflation tube 76, the rubber 87 can be squeezed rightwards through air pressure for a plurality of times, the holding rod 89 pushes the second rotating rod 98, the second rotating rod 98 rotates around the rotating shaft 80 to drive the right end of the first rotating rod 19 to slide rightwards, the first rotating rod 19 pushes the sliding ring 16 to slide rightwards and pushes the sliding block 38 to slide downwards, the sliding block 38 slides downwards and drives the first rotating shaft 35 to rotate through the first transmission mechanism 83, the first rotating shaft 35 drives the first gear 25 to rotate, the first gear 25 rotates to make the first sliding block 14 slide upwards, the first sliding block 14 slides upwards to make the switching gear 34 engaged with the first rotating gear 54, the switching gear 34 is disengaged from the spring switching gear 75, meanwhile, while the sliding ring 16 pushes the sliding block 38 to slide downwards, the upper end of the sliding ring 16 is engaged with the second rotating mechanism 17, the first clamping block 67 is clamped into the first clamping block groove 57, the power motor 45 is turned on, the power motor 45 drives the second rotating shaft 55 to rotate, the second rotating shaft 55 drives the switching gear 34 to rotate, the switching gear 34 drives the first rotating gear 54 to rotate, the first rotating gear 54 drives the first rotating shaft 82 to rotate, the first rotating shaft 82 drives the first rotating mechanism 44 to rotate, the first rotating mechanism 44 drives the second rotating mechanism 17 to rotate, the second rotating mechanism 17 drives the sliding ring 16 to rotate, the sliding ring 16 drives the rotating ring 47 to rotate, and the rotating ring 47 drives the rubber 87 to rotate, so that the handwriting can be automatically erased.

The invention has the beneficial effects that:

It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the invention. All falling within the scope of protection of the present invention. The protection scheme of the invention is subject to the appended claims.

Claims

1. An automatic eraser is characterized in that: the spring hand-grip dumb-bell comprises a main shell and a grip groove arranged in the main shell, wherein a grip part is arranged in the grip groove, the grip part comprises a grip rod which is symmetrical up and down, a connecting rod cavity which is symmetrical up and down is arranged on the right side of the grip groove in a communicating manner, a power switching part which is matched with the grip rod is arranged in the connecting rod cavity, spring cavities are arranged on the inner walls of the front side and the rear side of the grip groove in a communicating manner, a spring switching part is arranged in the spring cavity, a spring switching gear which is matched and connected with a switching gear in the power switching part in a meshing manner is arranged in the spring switching part, an annular groove is arranged on the right side of the connecting rod cavity in a communicating manner, a rotating part is arranged in the annular groove, a first rotating gear which is meshed with the switching, the front end of the first rotating shaft is fixedly connected with a first rotating mechanism, the right end of the first rotating mechanism is connected with a second rotating mechanism on the upper side of the annular groove in a rotating fit manner through a belt, the lower end of the second rotating mechanism can be connected with the upper end of a sliding ring in the annular groove in a tooth-shaped meshing fit manner, the sliding ring can be connected with a first rotating rod which is symmetrical up and down in the power switching component in a pushing fit manner, the right end of the annular groove is fixedly connected with a first clamping block, the right side of the annular groove is provided with a rotating ring, the left end of the rotating ring is provided with a first clamping block groove which can be matched with the first clamping block, the inner side of the annular groove is communicated with a rubber hole, a rubber which can slide left and right and rotate is arranged in the rubber hole, second clamping block grooves are arranged in an annular array manner on the rubber, and second clamping blocks which are arranged in an annular, the pneumatic component is arranged on the left side of the rubber; the power switching part comprises a second rotating rod which is arranged in the connecting rod cavity and can be matched with the holding rod, a rotating shaft is arranged on the second rotating rod, the second rotating rod is connected with the first rotating rod in a rotating fit manner through a second guide sliding shaft, second arc-shaped grooves which can be matched with the second guide sliding shaft are symmetrically arranged on the inner walls of the front side and the rear side of the second rotating rod, a sliding hole is arranged in the first rotating rod, a guide sliding rod which extends through the sliding hole is arranged in the connecting rod cavity, a sliding groove is arranged in the inner wall of the lower side of the annular groove, a sliding block which can be connected with the sliding ring in a push fit manner and can slide up and down is arranged in the sliding groove, a first spring resetting mechanism is fixedly connected with the left side and the right side of the sliding block, and a first transmission mechanism which is connected with the left end, the power tool is characterized in that a first sliding cavity is formed in the inner wall of the rear side of the grip groove, a rotatable first rotating shaft is arranged in the first sliding cavity, the right end of the first rotating shaft can be connected with the left end of the first transmission mechanism in a belt rotation fit mode, a first gear is fixedly connected to the first rotating shaft, the front end of the first gear is connected with a first sliding block capable of sliding up and down in a meshing fit mode, a power motor is fixedly arranged in the first sliding block, a rotating cavity is formed in the front side of the first sliding cavity, a power hole is formed in the first sliding cavity in a communicating mode, and the front end of the power motor is connected with a second rotating shaft capable of switching over the gear fixed connection in a power fit mode.

2. The automatic eraser of claim 1, wherein: the spring-grip part include with holding rod fixed connection's finger type hand protector, running fit be connected with on the holding rod with the first holding shaft of side inner wall rotary type fixed connection around the holding groove, the first arc wall of symmetry around being provided with in the holding groove, fixedly connected with can on the holding rod gliding first sliding shaft that leads in first arc wall.

3. The automatic eraser of claim 1, wherein: the spring switching component comprises spring sliding grooves which are arranged in the holding rod, the openings of the spring sliding grooves are opposite, the spring sliding grooves are communicated with the spring cavities, first guide sliding grooves are symmetrically arranged in the inner walls of the left side and the right side of each spring sliding groove, spring frame bodies which are symmetrical in the front-back direction and can slide in the front-back direction are arranged in the spring sliding grooves, the holding springs which are arranged in an array mode and have different elasticity are arranged between the spring frame bodies, spring sliding blocks which are symmetrical in the upper end and the lower end and extend into the spring sliding grooves are fixedly connected with the upper end and the lower end of each holding spring, hollow tubes are fixedly arranged in the spring sliding blocks, elastic ropes which are fixedly connected with the spring frame bodies are arranged in the hollow tubes, first guide sliding blocks which extend into the first guide sliding grooves are fixedly connected with the left end and the right end of each spring sliding block, second sliding cavities which are symmetrical in the front, and the sliding screw rod is symmetrically provided with second sliding blocks which are fixedly connected with the upper end of the spring frame body in a front-back manner.

4. The automatic eraser of claim 1, wherein: the pneumatic component comprises an inflator pump which is arranged in the grip groove and fixedly connected with the grip rod, the left end of the inflator pump is provided with a first one-way valve which can only admit air, the right end of the inflator pump is provided with a second one-way valve which can only give out air, the right end of the second one-way valve is fixedly connected with an inflation tube, the right end of the inflation tube extends into the inner wall of the right side of the grip groove and is communicated with an air pressure cavity in the grip groove, a rear inner wall of the air pressure cavity is provided with an exhaust valve, and a second spring reset mechanism fixedly connected with the rubber is arranged in the inner wall of the upper side and the.